What to do when iPhone 7 is showing Temperature: iPhone needs to cool down error, other issues

Hello everybody and welcome to a new #iPhone7 troubleshooting page. Today we answer 4 more iPhone 7 questions so hopefully you’ll find this post helpful. Temperature: iPhone needs to cool down error is usually a reactive message to overheating so if you have it in your phone, you might want to check our suggestions below.

If you are looking for solutions to your own #iOS issue, you can contact us by using the link provided at the bottom of this page.

When describing your issue, please be as detailed as possible so we can easily pinpoint a relevant solution. If you can, kindly include the exact error messages you are getting to give us an idea where to start. If you have already tried some troubleshooting steps before emailing us, make sure to mention them so we can skip them in our answers.

Below are specific topics we’re bringing for you today:

Problem 1: What you need to do when you have iPhone 7 Temperature: iPhone needs to cool down error after leaving it inside a hot car

I left my iPhone in the car and it was sunny, after returning to the car I found a warning message on the iPhone screen saying (The iPhone temperature is high, the phone need to cool down) so I’ve decided to turn the iPhone off, of which my decision was based on the battery energy by then which was at 23%. once I got home, I plugged my iPhone on the charger and it started displaying the Apple logo on a dark screen and it was way warm while on the charger. when I tried turning it on, nothing was coming on, except the low battery once I pull the phone off the charger. What should be the issue with it? — Pally Ndeevelo

Solution: Hi Pally. Your iPhone, like most electronic devices, is designed to work in regular room temperature. Its operating range should be between 0º and 35º C (32º to 95º F). Using the phone outside of this operating range can alter its behavior which may be perceived by users as a problem. Too much cold can significantly affect battery life, causing chemistry inside the battery to change. This often results to random shutdown as the battery can lose energy too fast. Too much ambient heat can also be problematic and may temporarily or permanently affect battery life. Leaving your phone in a hot car can lead to two things:

  • overheating, and
  • damaged battery.

If an iOS device is subjected to high ambient temperature, which in turn causes its internal temperature to rise beyond an acceptable range, it may have to alter its behavior to prevent damaging components. Below are the things that we usually observe when an iPhone gets way too warm:

  1. Charging, including wireless charging, slows or stops.
  2. The display dims or goes black.
  3. Cellular radios enter a low-power state. The signal might weaken during this time.
  4. The camera flash is temporarily disabled.
  5. Performance slows with graphics-intensive or augmented-reality apps or features.

Since your phone has obviously exceeded its heat tolerance level, you need to let it cool down for at least 2 hours. Turn it off and put it in a cooler place like a shaded place. Don’t cool it down by placing it inside a freezer though! Just let it sit for a while and avoid using it. This will give enough time for the system and battery in particular to return to their normal operating temperature.

After a couple of hours, turn the phone back on and see how it works. If the temperature warning continues, or if the phone becomes erratic, it’s possible that permanent damage may have occurred either in the battery or in the motherboard in general. Contact Apple to have it fixed.

Problem 2: iPhone 7 has gone black, unresponsive, no power

My son has an iPhone 7. This is a replacement phone from our phone insurance carrier as he lost the first phone. He has had the replacement phone for about 9 months with no issues. Just recently he was using his phone and all of the sudden the phone went black; no power.  He has tried to hard restart with no response. We took the phone to our cell phone carrier and they could not see where it may have gotten wet and my son stated he hasn’t gotten it wet. We cannot log into iTunes or his iPhone account since we cannot get the security ID. Is there anything we can do get get this phone started? Thank you. — Dawn Loose

Solution: Hi Dawn. iPhone troubleshooting for this type of issue is very limited. Below are the things that you must try.

Use another set of charging cable and adapter

Given the circumstances, your first troubleshooting step is to ensure that the device can receive a charge properly by using known working accessories. If you have another charging cable and adapter, be sure to use them to charge the phone for at least 30 minutes. After that, try to turn the phone on again.

Verify if it’s a screen issue

There’s a difference between a phone that won’t turn on and a screen that won’t turn on. The latter means that the phone continues to charge and shows signs of turning on like red LED when charging, makes sound or vibrate notifications when receiving messages and notifications, even though the screen may stay black.

Update the phone via DFU Mode

If the phone appears to turn on but the screen is black, the problem must be isolated to the screen only. There’s a chance that the issue is due to a glitch in the operating system so make sure that you try to update the device via DFU mode. Here’s how:

  1. In your computer, close all active apps.
  2. Open iTunes.
  3. Turn off your iPhone. If you can’t turn it off normally, let the battery drain to 0% so the phone powers down on its own. Charge the phone for at least an hour without attempting to turn it on.
  4. Connect your iPhone to the computer via USB cable.
  5. Press and hold the Power button for at least 3 seconds.
  6. Press and hold the Volume Down button on the left side of the iPhone while continuing to hold the Power button. Be sure to hold both Power and Volume Down keys for 10 seconds. If Apple logo appears at this time, repeat steps 5 and 6. Apple logo should not show at all.
  7. Continue to hold Volume Down key for another 5 seconds. If the Plug into iTunes screen is displayed, repeat steps 5-7. Plug into iTunes screen should not show up.
  8. You’ll know that your phone is in DFU mode if the screen remains black. Your computer should then tell you that iTunes has detected an iPhone.
  9. Follow the on-screen steps in your computer to do a full recovery.

The steps above require the use of a computer (Mac or Windows) so be sure to have one before you attemptit

Contact Apple for additional support

If the phone is totally unresponsive or if you can’t return the phone back to its normal working order, you should consider asking help from Apple.

Problem 3: iPhone 7 black screen issue, won’t turn on

My iPhone 7 became black out when I was doing video camera. I could still hear the voice from the other end but just the screen was black, but later (within a minute) it completely died, black screen and no voice at all. I tried to charge, but it did not work. No display at all on the screen, and I don’t know whether it was charging or not. After charging for overnight, I tried to press the on/off button on right side and meanwhile the button on the front, holding for more than 10 seconds, still nothing happened. It cannot be turned on. — Lisa

Solution: Hi Lisa. iPhones can die for a variety of reasons. If the only thing that you did differently before the problem occurred was to use the camera app (we presume your phone was not dropped nor exposed to elements/water), then the basic software troubleshooting for iPhones may help. The circumstances may be different for your case but our suggestions for Dawn above may help. Be sure to follow them and see if any of them will work.

Problem 4: iPhone 7 screen goes purple, screen only works when pressed on the sides

My screen goes a purple colour and I can’t see it that well during the day. Till I get home at about 4.30. I can just about see words then. It not pictures. I can use ok then. Then other times it operates as it should. Opens apps. Sends emails and messages. Rings people and has even put me live on Facebook! Can go off for days. Last night I decided to manipulate the phone slightly bending it. And it come on. If I catch it quick enough I can reserve the screen colour by pressing all side buttons randomly. Please help. Thank you In advance. — Michele.faulkner

Solution: Hi Michele. If the only way to make the screen work normally is by applying some pressure on it or on its sides, that’s a clear sign of an on-going screen assembly malfunction. Something must have gotten loose inside. This usually occurs when a phone is dropped. The height of the drop is irrelevant. Some phones can be dropped from over a meter to a hard surface without any apparent damage, while others can immediately show signs of problems at the slightest drop. If you did drop your phone before, you should contact Apple so they can check the hardware and replace the screen if necessary.

If your phone was never dropped nor suffered any physical damage at all, consider doing a full Restore and see how it goes afterwards. Here’s how:

  1. Create a backup of your files. You can do that in a number of ways but the fastest and most effective way is by using iTunes in your PC or Mac. If you don’t want to create a backup at all, you can simply erase everything on the phone by following the steps in this link.
  2. Connect your iPhone to your computer with the cable that came with your phone.
  3. We assume you remember your phone’s passcode so simply enter it when you’re prompted for it.
  4. Select your iPhone once iTunes asks you for the specific device.
  5. Once you’re in the Summary panel or screen, select the option that will restore your device (Restore).
  6. Confirm by clicking on Restore button.
  7. Wait for a few moments while iTunes restores your device to its factory settings. It may also take some time if iTunes will need to install an updated operating system version.
  8. After this factory reset, all software settings should be restored to their defaults.


Engage with us

If you happen to have a problem with your own iPhone, let us know about it and we will do our best to post them and their solutions  in our upcoming articles. You can use this link to contact us for assistance. We can’t guarantee an answer to every question but rest assured that we will exhaust everything on our end to help you.

Be as detailed as possible when describing your problem to help us diagnose your issue easily. If you can include error messages, popups, attempted troubleshooting steps, and circumstances leading to the problem, that would be very helpful.